Light hydrocarbon gases in Lake Tanganyika hydrothermal fluids (East-Central Africa).

Botz, R. W. and Stoffers, P. (1993) Light hydrocarbon gases in Lake Tanganyika hydrothermal fluids (East-Central Africa). Chemical Geology, 104 (1-4). pp. 217-224. DOI 10.1016/0009-2541(93)90152-9.

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Abstract

Active hydrothermalism occurs in the shallow-water environment of northern Lake Tanganyika. Carbon dioxide of magmatic origin ([delta]13C = -9.1 to -3.8[per mille sign]) is the major gaseous component. In addition to CO2 variable amounts of light hydrocarbons (C1 to C6) were detected. The isotopic composition of methane ([delta]13C = -58.0 to -50.4[per mille sign]; [delta]D = -199 to -149[per mille sign]) indicates both a bacterial and a thermogenic source for the hydrothermal gas. The mechanism for bacterial methane formation remains unknown. However, according to the [delta]D-values it is likely that most of the bacterial methane formed by CO2 reduction. The isotopic compositions of ethane ([delta]13C = -36.6 to -26.7[per mille sign]) and propane ([delta]13C = -31.1 to -25.6[per mille sign]) reflect the cogenetic origin of these thermogenic higher hydrocarbons.

Document Type: Article
Research affiliation: Kiel University
Refereed: No
DOI etc.: 10.1016/0009-2541(93)90152-9
ISSN: 0009-2541
Date Deposited: 02 Feb 2012 09:27
Last Modified: 23 Sep 2019 17:08
URI: http://oceanrep.geomar.de/id/eprint/16391

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